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• D,4,1 Access Road <br />The existing access road (Yellow Creek Jeep Trail) will be,widened and <br />graveled from the paved Ryan Gulch road (and County Road 83) to the plant <br />site. As shown in Exhibit B, the proposed up-graded road sections total 4,5 <br />miles in length and extend from the county road in Section 4, T2S, R98W <br />across BLM lands to the IRI Sodium Minerals Lease, terminating at the plant <br />site. <br />Drainage will be provided, as required, to control surface water runoff for <br />a 100-year storm. Ditches will be "V" bottom or flat bottom with a minimum <br />depth of 18 inches and, where necessary, energy absorbers will be <br />constructed to regulate flow velocities and prevent excessive erosion. <br />Culvert pipe will bf~ corrugated steel pipe (CSP) conforming to AASHTO <br />M36-14, and bedded <ind backfilled with sand or gravel compacted to 95 <br />percent of maximum density (ASTM-1557). Rock rip-rap will be installed at <br />the culvert outfalls t.o dissipate energy and prevent erosion. <br />• The 20-feet wide road surface will consist of a 4-inch (minimum) layer of <br />gravel compacted to 95 percent of maximum density (ASTM-1557). The road <br />surface will be crowned to provide drainage. Figure D-6 shows a typical <br />cross-section of the upgraded access road. No significant cut or fills are <br />anticipated. <br />D.4.2 Utilities <br />Electrical power will be supplied by two 400-kw natural gas fueled <br />generators. Process Beat will be supplied by an 800-horsepower natural gas <br />fired boiler. Natural gas will be obtained from an existing pipeline <br />located two miles south of the lease. A right-of-way application will be <br />filed with the Bureau of Land Management (October 1983) for a pipeline to <br />bring natural gas to the plant site. This pipeline will parallel an <br />existing Jeep trail as shown in Exhibit B. <br />• The 2-inch diameter n~itural gas pipeline will be constructed along the Jeep <br />trail from a point in Section 2, T2S, R98W where the trail crosses an <br />D-10 <br />